print('{0}---{1}---{2}'.format(1, 2, 3))
str4 = '6666'
print(f'这个程序{str4}')

# print(f'{i} * {j} = {i*j}')
for i in range(0, 101, 2):
    print("========开始下载========")
    if i == 100:
        print("下载完成")
        break
    else:
        print(f'{i}%[', "*"*(i//2), "."*(50-i//2))

sep = ','
print(sep.join(str4))
print(str)

str5 = 'good' + 'morning'